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Option Explicit

Private Sub Form_Load()

  '設(shè)置本地任意可用端口，這樣系統(tǒng)會自動分配一個未被占用的端口

  Winsock1.LocalPort = 0

  Winsock2.LocalPort = 0

  '設(shè)置通信協(xié)議為 TCP 協(xié)議

  Winsock1.Protocol = sckTCPProtocol

  Winsock2.Protocol = sckTCPProtocol

  '開始監(jiān)聽，等待客戶端連接

  Winsock1.Listen

  Winsock2.Listen

  '初始化PLC地址，IP，端口數(shù)據(jù)

  Open App.Path & "\data\add.ini" For Binary As #1

  Add = StrConv(InputB$(LOF(1), 1), vbUnicode)

  Close #1

  Open App.Path & "\data\ip.ini" For Binary As #1

  ip = StrConv(InputB$(LOF(1), 1), vbUnicode)

  Close #1

  Open App.Path & "\data\port.ini" For Binary As #1

  port = StrConv(InputB$(LOF(1), 1), vbUnicode)

  Close #1

  reg.Text = "0"

  high.Text = "0"

  low.Text = "0"

End Sub



Private Sub SendData_Click()

  '如果 Winsock 處于已連接狀態(tài)

  If Winsock1.State = sckConnected Then

    '構(gòu)造 Modbus TCP 請求數(shù)據(jù)

    Dim PLC_Add As Long

    Dim dataToSend As Integer

    Dim dataToSend1 As Integer

    Dim dataToSend2 As Integer

    'Add PLC起始地址，reg:寄存器地址，high/low高低字節(jié)位（數(shù)據(jù)）。

    PLC_Add = Val(Add.Text)

    To_reg = Val(reg.Text)

    To_high = Val(high.Text)

    To_low = Val(low.Text)

    'MODBUSTCP報文

     Dim request As String

    request = Chr(&H0) & Chr(&H1) & Chr(&H0) & Chr(&H0) & Chr(&H0) & Chr(&H6) & Chr(&H1) & Chr(&H6) & Chr(PLC_Add - 40001) & Chr(To_reg) & Chr(To_high) & Chr(To_low)

      '發(fā)送構(gòu)造好的請求數(shù)據(jù)給 PLC

      Winsock1.SendData request

    Exit Sub

  

  Else

    '如果未連接到 PLC，彈出消息提示

    MsgBox "Not connected to PLC."

  End If

  

End Sub


Private Sub Timer1_Timer()

  '定時器事件，用于周期性檢查連接狀態(tài)并更新界面

  If Winsock1.State = sckConnected Then

    '如果連接成功，將標簽的背景色設(shè)置為綠色（十六進制顏色值 &HC000&）

    connection.BackColor = &HC000&

  Else

    '如果未連接，將標簽的背景色設(shè)置為紅色（十六進制顏色值 &HFF&）

    connection.BackColor = &HFF&

  End If

    

End Sub



Private Sub Timer2_Timer()

  '定時器事件，用于周期性檢查連接狀態(tài)并重新連接

  If connection.BackColor = &HFF& Then

  '檢查 Winsock 的狀態(tài)，如果不是已關(guān)閉狀態(tài)

  If Winsock1.State <> sckClosed Then

    '關(guān)閉當(dāng)前連接，以便重新連接到 PLC

    Winsock1.Close

    '確認連接IP地址及端口

    Timer3.Interval = 1

  End If

  If Winsock2.State <> sckClosed Then

    '關(guān)閉當(dāng)前連接，以便重新連接到 PLC

    Winsock2.Close

    '確認連接IP地址及端口

    Timer3.Interval = 1

  End If

  

    '變量

    Dim plc_ip As String

    Dim plc_port As Integer

    '讀取IP及端口參數(shù)

    plc_ip = ip.Text

    plc_port = port.Text

    '連接到指定的 PLC IP 地址和端口號，這里需替換為實際的 PLC IP 和端口

    Winsock1.Connect plc_ip, plc_port

    Winsock2.Connect plc_ip, plc_port

    '停止IP地址及端口確認

    Timer3.Interval = 0

  End If

End Sub



Private Sub Command1_Click()

    '打開通訊設(shè)置窗口

    Form2.Show

End Sub



Private Sub ConnectToPLC_Click()

  '判斷通訊是否啟動連接

  If Timer2.Interval = 0 Then

     '開始連接

    Timer2.Interval = 1

  ElseIf Timer2.Interval = 1 Then

    '判斷通訊是否啟動連接

    If Winsock1.State <> sckClosed Then

    '停止連接

    Timer2.Interval = 0

    '斷開連接

    Winsock1.Close

    Winsock2.Close

    

    End If

    

  End If



End Sub



Private Sub Timer3_Timer()

    '讀取起始地址

    Open App.Path & "\data\add.ini" For Binary As #1

    '更新起始地址

    Add = StrConv(InputB$(LOF(1), 1), vbUnicode)

    Close #1

    '讀取IP地址

    Open App.Path & "\data\ip.ini" For Binary As #1

    '更新IP地址

    ip = StrConv(InputB$(LOF(1), 1), vbUnicode)

    Close #1

    '讀取端口

    Open App.Path & "\data\port.ini" For Binary As #1

    '更新端口

    port = StrConv(InputB$(LOF(1), 1), vbUnicode)

    Close #1

    '停止更新

    Timer3.Interval = 0

End Sub





Private Sub TCP0_Click(Index As Integer)

  '對齊寄存器地址

  If reg.Text <> 0 Then

    reg.Text = 0

  End If

  '開關(guān)量轉(zhuǎn)換

  If reg.Text = 0 Then

    If low.Text = 0 Then

      low.Text = 1

      SendData_Click

    ElseIf low.Text = 1 Then

      low.Text = 0

      SendData_Click

    End If

  End If



End Sub



Private Sub TCP1_Click(Index As Integer)

  '對齊寄存器地址

  If reg.Text <> 1 Then

    reg.Text = 1

  End If

  '開關(guān)量轉(zhuǎn)換

  If reg.Text = 1 Then

    If low.Text = 0 Then

      low.Text = 1

      SendData_Click

    ElseIf low.Text = 1 Then

      low.Text = 0

      SendData_Click

    End If

  End If



End Sub



Private Sub TCP2_Click(Index As Integer)

  '對齊寄存器地址

  If reg.Text <> 2 Then

    reg.Text = 2

  End If

  '開關(guān)量轉(zhuǎn)換

  If reg.Text = 2 Then

    If low.Text = 0 Then

      low.Text = 1

      SendData_Click

    ElseIf low.Text = 1 Then

      low.Text = 0

      SendData_Click

    End If

  End If



End Sub



Private Sub TCP3_Click(Index As Integer)

  '對齊寄存器地址

  If reg.Text <> 3 Then

    reg.Text = 3

  End If

  '開關(guān)量轉(zhuǎn)換

  If reg.Text = 3 Then

    If low.Text = 0 Then

      low.Text = 1

      SendData_Click

    ElseIf low.Text = 1 Then

      low.Text = 0

      SendData_Click

    End If

  End If



End Sub



Private Sub TCP4_Click(Index As Integer)

  '對齊寄存器地址

  If reg.Text <> 4 Then

    reg.Text = 4

  End If

  '開關(guān)量轉(zhuǎn)換

  If reg.Text = 4 Then

    If low.Text = 0 Then

      low.Text = 1

      SendData_Click

    ElseIf low.Text = 1 Then

      low.Text = 0

      SendData_Click

    End If

  End If



End Sub



Private Sub TCP5_Click(Index As Integer)

  '對齊寄存器地址

  If reg.Text <> 5 Then

    reg.Text = 5

  End If

  '開關(guān)量轉(zhuǎn)換

  If reg.Text = 5 Then

    If low.Text = 0 Then

      low.Text = 1

      SendData_Click

    ElseIf low.Text = 1 Then

      low.Text = 0

      SendData_Click

    End If

  End If


End Sub



Private Sub end_Click()

End

End Sub